Mining-drill



-2 Sheets-Sheen 1.

J. R. HOWBLLS.

Mining-Drill.

Patentedlan. 13,1880.

NPEERS. PNOTU-UTHOGRAPMER. WASHINGTON D C.

2 Sheets-Sheath 2.

J. R. HOWELLS,

Mining-Drill.

No. 223,590. Patented Jan. 13, 1880.

UNITED STATES "ATENT OFFICE.

JOHN R. HOWELLS, lOF PLYMOUTH, PENNSYLVANIA.

MINING-DRILL.

SPECIIEICATIOAT forming part of Letters Patent No. 223,590, dated January 13, 1880.

Application lcd March 11, 1879.

Tf all 'whom it may concern:

Be it known that I, JOHN'R. HOWELLs, of Plymouth, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in Mining-Drills; and I do hereby declare that the following isa full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification, in Which- Figure 1 is a side elevation of the drill; Fig. 2, a plan view of same; Fig. 3, an end elevation; Fig. 4, a section through Fig. 3; and Fig. 5, a face view of the drivin g-wheel, a part thereof being broken away, showing` the featherin g ofthe drivi 11g-screw and dri vin g-wheel.

My invention relates to hand-drills for use principally in coalmining, and is an improvement on Patent No. 190,239. My improvements have particular reference, first, to the jaws and arms thereof and mode of connecting them; secondly, to a guide for a bit; thirdly, to the turn-table, constructed with a slot therein, so that the bit-stock can be turned to any desired angle; fourthly, to a hinged frame constituting a part of the bearing for the feedscrew; ifthly, to the construction of the driving-shafts, whereby the crank can be changed from one part to another thereof, thereby ad mitting of the drill being worked close to the ribs; and, lastly, to the combination of parts hereinafter particularly described.

In the accompanying drawings, the letter A indicates the stock of the device, the lower portion of which forms a stationary jaw, B', rounded on the outer surface, and having steel teeth embedded therein, and at the foot thereof a sharpened toe. This stock is flattened just above the jaw, at right angles thereto, as seen at C, Fig. 2, and to this flattened portion there is fulcrumed the movable jaw B, the connection being effected by two metal plates, D D', one on either side of the stock and upper eX- tension, O', of movable jaw, which is flattened likewise as the stock, and extending` across from one to the other, and bolted to the two by means of bolts c c and nuts thereon.

The object in iattening the stock and extension of movable jaw, as just described, is to re-enforce and strengthen the jaws without any increase of metal at those points.

The extension of the movable jaw and the part of the stock opposite thereto are tapered on the inside from the top of the jaw to the top of the extension, at which point, both in the stock and in the extension, there is formed an eye, and through both eyes is passed abolt, E, on the threaded end of which, and bearing against the movable jaw, works a thumb-screw, F. By screwing or unscrewing this thumbscrew the movable jaw is moved to or from the stationary jaw.

To the upper end of the stock A there is pivoted a turn-table, G, by means of a bolt, g. In this table there is cut a circular groove, d, and through this groove and the stock there is passed a bolt, e, on the end of which is screwed a thumb-screw, f. By screwing up this thumb-screw the turn-table is firmly clamped to the stock, and by unscrewing the turn-table is free to be moved to the right or left, and to be held at any angle by tightening the screw.

Two posts, H H', are riveted or otherwise secured in an upright position to the turntable, and they support a frame, I, which frame may be cast with the posts, or the two sides may be cast therewith and the end mortised, riveted, or otherwise secured to the sides. On both ends of this frame there are cast or otherwise formed downwardly-projecting ears h h', which constitute journal-bearings for the shaft J, which is made with a shoulder, b, at bothends, i'n order that a crank,

A', may be connected to either end and held there, if desirable, by a pin, t', passed through a hole in the shoulder. To this shaft, near one end thereof within the frame, there is keyed apinion, M, which meshes with a driving-wheel, N, secured to the feed-screw o. This drivingwheel has one or two studs or keys, p, formed within its hub, as shown in Fig. 5, which tit into key-seats 7c, formed in the threaded feed-shaft. This shaft has its bearings or is journaled in threaded semicircular grooves K K', formed in the sides of the frame I just above, though not of necessity so, the supports H H', and is held therein by two bars,.L L', hinged at one end to the IOO frame I, and having formed between the ends semicircular grooves P P', which fit over the threaded feed-screw, and at the other end two slots, which iit over lugsQ Q' at the other end of frame I, and which have holes through them, so that a pin, It, may be passed through both and securely lock the bars to the frame I, thereby holding the feed-screw in its bearings. These bars L L', hinged and locked to the frame I, as described, may be said to constitute the frame I a hinged locking-frame for the feed-shaft, and I so term it. The lockingframe so constructed will admit of the feedscrew being easily removed for any purpose whatever, and none of the parts are apt to get lost or to be damaged. One end of the feed-screw is shouldered, as at b', while to the other end are secured a bit-stock, S, and bit T, by any of the well-known means.

The object in providing the feed-shaft with a shoulder, b', and the pinion-shaft with two shoulders, b, is to admit. of the application of the moving crank to. either of the three sides of the frame or drill, which is necessary in order to work close to the side of the rib.

A rod, u., is bolted to the stock A, or to the plates joining the two jaws, as is shown in Figs. l and 2, and extends as far as the bit, at which end it has a collar, V, to lit around the bitand form a guideiorthesame. This guide, however, must be disconnected from the drill when the angle ofthe bitis materially changed 5 otherwise it will prevent the movement of the bit from one point to another without changing the position of the stock A.

In operation the jaws of the device are inserted in an opening made in the coal or other material to be drilled for that purpose, and the thumb-screw F screwed up, which action expands the jaws and gives the stock a lirm hold in the opening. The drilling is now proceeded with, and when the feedshaft has passed to its limits the motion of the crank is reversed and the feed-shaft brought back to its first position; or the bars L L' maybe thrown back and the feed-shaft lifted from contact with the threaded grooves in frame I, and the shaft lifted back to its first position, which last is the quickest way to return it to its first position.

If it is desired to drill a number of holes without moving the drill, it is only necessary to loosen the thumb-screw f, when the turntable, and with it the feed-screw, may be turned to any desired angle, and securely held there by tightening the thumb-screw. This operation assumes that the bit-guide is not used.

Having described my invention, what I claim isl. The jaws B B', connected by plates D D', and operated by bolt E and thumb-screw F, substantially as set forth.

2. The stoel; A, provided with jaw B', in combination with jaw B, the jaws provided with teeth, and the stock and movable j aw dattened, as described, to 11e-enforce and strength en said jaws, at right angles between jaws and operating-bolt and thumb-screw, substantially as and for the purpose set forth.

3. The turn-table G, provided with slot d, in combination with feed-screw O, bolt e and its nut, and shaft J, the whole operating substantially as described, for the purpose set forth. Y

4. The feed-screw O, provided with drivingwheel N, in combination with shaft J, provided with pinion M, the feed-shaft provided with shoulder b', and the pinion-shaft provided with shoulder b,- substantially as and for the purpose set forth.

5. The combination of feed-screw O and driving-wheel N with shaft J and pinion M,'

my own Iv aflx my signature in presence of two witnesses.

JOHN R. HOWELLS.

Witnesses:

WM. GWYNNE JONES, HENRY I?. MoGLosKEYA 

